Anthropic’s Public Benefit Fund holds 846,840,960 shares, about 3.5 times the 240.6 million to 244.2 million shares that each of the company’s seven co-founders beneficially owns, according to the S-1/A Anthropic filed with the SEC on 10 November, by our arithmetic.
At the $74 midpoint of the $70 to $78 IPO range, the fund’s stake is worth $62.7 billion and each co-founder’s $17.8 billion to $18.1 billion, by our arithmetic. The seven together hold 1,697,109,240 shares, so the fund equals about half of the founders’ combined stake.
Business Pill · IPO Float
A short explainer on IPO float, the share of a company sold in its listing. It teaches the general idea and does not discuss Anthropic’s offering, its founders or its fund.
The key insight: As we read the ownership table, Anthropic’s own charitable fund holds far more stock than any single co-founder: 846,840,960 non-voting shares, about 3.5 times each co-founder’s stake and about half of all seven combined, by our arithmetic.
The S-1/A’s principal and selling stockholders table gives beneficial ownership as of 30 September 2026. It lists Dario Amodei with 240,637,980 Class A shares, Daniela Amodei with 241,408,940, Tom Brown with 244,173,040, Jack Clark with 242,271,840, Jared Kaplan with 242,351,170, Sam McCandlish with 243,383,850 and Christopher Olah with 242,882,420.
Each figure is 3.6% or 3.7% of Class A shares before the offering, the table says. The counts include stock options exercisable and RSUs expected to settle within 60 days of 30 September; Dario Amodei’s 240,637,980, for example, includes 2,185,400 option shares and 639,500 RSU shares.
The table lists another 4,621,120 shares under Dario Amodei’s name as “shares subject to voting proxies”: shares held by two charitable funds, Daffy Charitable Fund and Dechomai Asset Trust, that he has the right to vote under proxy agreements, the filing says. With them, his total is 245,259,100.
Shares held by Anthropic’s Public Benefit Fund against each co-founder’s beneficially owned Class A shares as of 30 September 2026, per the S-1/A’s ownership table. Co-founder counts include options and RSUs within 60 days. Ratios are our arithmetic.
The Fund’s 846,840,960 Shares
Anthropic says it contributed 846,840,960 shares of Class N common stock, “representing 5% of our fully diluted shares as of June 30, 2026”, to Anthropic Public Benefit Fund, LLC, “our wholly owned subsidiary dedicated to the Company Purpose”. Our first piece on the fund valued that stake at $59.3 billion to $66.1 billion across the range.
Class N shares carry no vote except as required by law, the filing says. It puts Class N shares outstanding before the offering at 5,307,329,452, after the fund’s issuance, so the fund holds about 16% of the class, by our arithmetic; our explainer on non-voting stock covers how the class works.
Against the fund, the smallest co-founder count in the table, Dario Amodei’s 240,637,980, gives a ratio of 3.52 times, and the largest, Tom Brown’s 244,173,040, gives 3.47 times, by our arithmetic.
What the Co-Founders Sell in the IPO
Each of the seven co-founders is offering 3,378,378 Class A shares in the IPO, the table shows. At the $74 midpoint that is about $250 million each and $1.75 billion for the seven, by our arithmetic, or about 2.8% of the fund’s value at the same price.
After the offering, each co-founder would hold 237.3 million to 240.8 million Class A shares, or 3.2%, and 1.6% of total voting power, the table says. The filing says a separate Founder LLC of the co-founders is issued one Class F share in connection with the offering, entitled to a fixed 50.1% of the voting power.
The fund, the co-founders and the shares they sell in the IPO, valued at the $74 midpoint of the S-1/A range. Values are our arithmetic and notional; the IPO has not priced.
The 80% Pledges Next to the Fund
The S-1/A says the co-founders “have each pledged to dedicate 80% of their personal equity in Anthropic to philanthropic causes”. It calls these commitments “voluntary, revocable expressions of each co-founder’s philanthropic intent and do not constitute legally binding obligations”.
Applied to the table’s 1,697,109,240 shares, 80% would be about 1.36 billion shares, 1.6 times the fund, by our arithmetic. That is illustrative only: the filing words the pledge in terms of personal equity and says the timing, amount and recipients of any donations are uncertain.
The Structural Read
As we read it, the fund and the co-founders sit on opposite sides of the voting split: the fund’s Class N shares carry no vote except as required by law, while the co-founders vote their Class A shares and, through the Founder LLC, a fixed 50.1% of voting power.
As we read the pledge language, the 80% commitments could in time add far more stock to charity than the fund holds today, but the filing calls them revocable and gives no timetable.
Anthropic S-1/A, 10 November 2026
“Our novel capital and corporate governance structure has been carefully designed”
Three Implications
FOR THE FOUNDERS Each of the seven is offering 3,378,378 Class A shares in the IPO, about $250 million at the $74 midpoint, by our arithmetic.
FOR THE FUND Its 846,840,960 Class N shares are about 16% of the class, by our arithmetic, and may be transferred, donated or sold to fund Anthropic’s public benefit initiatives, the filing says.
The framework argues that Anthropic “is becoming the first major AI lab actively attempting to define the governance layer of the AI stack.”
As we read it, the S-1/A writes a version of that governance thinking into Anthropic’s own share structure: a non-voting charitable fund, a Founder LLC with fixed voting power, and pledges the filing calls revocable. The framework predates the filing and does not discuss the fund.
What Is Not Established
The dollar values use the S-1/A’s price range, not a market price; the IPO has not priced. Pricing is expected on 18 November and trading on 19 November, per Anthropic’s IPO website filed with the SEC.
Beneficial ownership under SEC rules counts shares a holder can vote or invest, including near-term options and RSUs, so it can differ from what each co-founder owns outright. The filing does not say when the fund will make its first grants. We did not contact Anthropic for this piece.
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Anthropic’s Public Benefit Fund holds 846,840,960 non-voting shares, about 3.5 times the 240.6 million to 244.2 million shares each co-founder beneficially owns, and about half of the seven founders’ 1.70 billion combined, by our arithmetic. Each founder is selling 3,378,378 shares in the IPO; the 80% pledges the filing describes are revocable.
A note on sourcing. The share counts, ownership percentages, shares offered, voting power, fund terms, pledge wording and price range are from Anthropic’s S-1/A (Amendment No. 2) filed with the SEC on 10 November 2026, chiefly its principal and selling stockholders table, which gives beneficial ownership as of 30 September 2026. The pricing and trading dates are from Anthropic’s IPO website, filed with the SEC as a free writing prospectus. The ratios, sums and dollar values are our arithmetic at the range’s $74 midpoint. Anthropic was not contacted for this piece.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
